Lucent Technologies Lineage
®
2000 ECS Battery Plant H569-403
Issue 4 February 1997
Engineering, Planning, and Ordering 3 - 17
the load supported by the additional rectifiers. Since a fraction of
any added rectifier capacity is needed for recharging added
batteries, the matching incremental change in battery capacity
depends on the desired recharge factor. (See paragraph “Charge
Capacity and Recharge Time” for an explanation of charge
capacity and recharge factor.) Since the charge capacity of the
Lineage
®
2000 ECS battery plant grows in 100 ampere
increments with the SR100/+24V rectifier, the optimum battery
capacity increment may be approximated as follows.
A-hr increment = (100 A) x (reserve time in hours) /
(minimum recharge factor)
System Reliability: In most battery plants it is possible have an
open circuit in the battery subsystem that could remain
undetected until ac power is lost and battery power is required.
Therefore, for applications where service reliability is critical, it
is a good practice to select battery size such that at least two
strings are required. Multiple strings allow for easier
maintenance on the battery system without jeopardizing service
to the load equipment.
Cable and Load
Breaker Sizing
In this section, power cabling for the dc distribution and battery
subsystems is covered, including the following subtopics.
•
Maximum and minimum wire gauges
•
Wire type
•
Crimp lugs
•
Circuit breaker selection
To determine actual wire sizes, equipment locations, cable rack
and routing systems at the site must be known. Since the battery
plant shares the cabling system with other building systems,
cabling engineering is not completely defined by this section of
the product manual. In this section, the basics are derived for the
dc power cabling which will be required as part of a complete
cable engineering process. Lucent offers cabling engineering
services that are separate from battery plant engineering.
Contact your Lucent Account Executive for more information
on available services.
In general, wire type RHW or RHH should be used for dc power
wiring. This type of wire is commonly available in American
Wire Gauge (AWG) Stranded (e.g., KS-5482) and in a finer